Rigidity-induced toughening and plastic-zone enlargement toughening via loading-mode and size-effect: two toughening mechanisms probably adopted in biocomposites. - Lei, Peidong; Yang, Pengfei; Meng, Zhiqiang; Chen, Huihan; Zhou, Junjie; Li, Zhongqi; Zhou, Zihan; Liu, Bin (Engineering Fracture Mechanics, 2026)